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To use your HTC Hero on other network ,you need to unlock the network lock. Using Unlock codes is the safe and easy way to unlock the network lock. Visit Onlinegsmunlock.com to get the unlock code for your mobile. There you have to give your Country and current network name along with your IMEI number to get unlock code. They will give you unlock code along with instruction on how to unlock. Follow the instruction correctly and unlock your HTC Hero. After unlocking the mobile you can use it with other(GSM) network.